// Copyright(c) 2019 - 2020, #Momo
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met :
// 
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and /or other materials provided wfith the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "Platform/GraphicAPI.h"

namespace MxEngine
{
    struct BufferAllocatorImpl;

    struct BufferAllocation
    {
        const size_t Offset;
        const size_t Size;
    };

    class BufferAllocator
    {
        inline static BufferAllocatorImpl* impl;
    public:
        static void Init();
        static void Destroy();
        static BufferAllocatorImpl* GetImpl();
        static void Clone(BufferAllocatorImpl* other);
        static void AllocateBuffers();

        static VertexBufferHandle GetVBO();
        static IndexBufferHandle GetIBO();
        static VertexBufferHandle GetInstanceVBO();
        static VertexArrayHandle GetVAO();
        static ShaderStorageBufferHandle GetSSBO();
        static BufferAllocation AllocateInVBO(size_t sizeInFloats);
        static BufferAllocation AllocateInIBO(size_t sizeInIndices);
        static BufferAllocation AllocateInInstanceVBO(size_t sizeInInstances);
        static BufferAllocation AllocateInSSBO(size_t sizeInBytes);
        static void DeallocateInVBO(BufferAllocation allocation);
        static void DeallocateInIBO(BufferAllocation allocation);
        static void DeallocateInInstanceVBO(BufferAllocation allocation);
        static void DeallocateInSSBO(BufferAllocation allocation);
    };
}